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9.0 Miscellaneous System-Related Information
This section contains miscellaneous system-related system information that
will aid you in trouble shooting.
PS/2 Displays:
If you experience problems with a PS/2 (*) display, and
the Advanced Diagnostic video test and the display self-tests do not
indicate a problem, consider the location of the display and any
surrounding devices.
Certain fluctuating low-frequency magnetic fields
can cause the screen to distort, jitter, or roll.
are generally present around transformers, small appliances and even
nearby florescent lighting fixtures.
may have to move the device or the display.
to each other (less than 12 inches) could
Note:
Because of the differences in the Earth's magnetic fields, displays
are designed to be used in a specific hemisphere.
a display marketed for use in the Southern Hemisphere is relocated
to far northern latitudes (Australia to Norway) the colors will
probably be distorted.
Maintenance Service pamphlet lists FRU numbers and model numbers
for Northern and Southern Hemisphere displays.
You should avoid moving a color display while it is powered-on.
movement can result in some screen discolorations.
correct the colors, power-off the display for twenty minutes (the display
automatically degausses the screen after it is off for twenty minutes).
It is possible for a display to cause diskette drive read/write errors if
the drive and the display are too close.
diskette drives should be at least 3 inches.
Surge Suppressors:
External surge suppressors are not required on PS/2
systems.
The systems are designed to resist typical power surges.
severe surge levels are possible, but the probability is quite low.
defective external surge suppression device can cause intermittent system
failures.
No design or performance standards have been established for
these devices and there is no easy way to test them.
undetectable intermittent failures and there is a surge suppressor
installed, try operating the system without the surge suppressor.
Uninterruptible Power Devices:
to supply continuous power to the system in the case of a power outage.
They are usually used only when the potential loss of data or use is
unacceptable.
Numerous devices of this type are available, but not all of them produce
an AC sine-wave voltage.
uninterruptible power device is defective or the wrong type, the result
could be undetectable intermittent failures.
(*) Trademark of the International Business Machines
Corporation.
IBM PS/2 Model 90 XP 486 and 95 XP 486 HMR
Miscellaneous System-Related Information
If you experience this problem, you
Displays that are too close
cause similar problems.
The parts catalog in the Hardware
Distance between displays and
Uninterruptible power devices are designed
U.S. PS/2 systems require sine-wave.
¦ Copyright IBM Corp. 1990, 1992
9.0 - 1
These magnetic fields
For example, if
The
If this happens, to
More
A
If the system has
If the
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